| Copyright | (c) Adam Gundry 2015-2016 |
|---|---|
| License | see libraries/base/LICENSE |
| Maintainer | [email protected] |
| Stability | internal |
| Portability | non-portable (GHC extensions) |
| Safe Haskell | None |
| Language | Haskell2010 |
GHC.OverloadedLabels
Description
This module defines the IsLabel class is used by the
OverloadedLabels extension. See the
wiki page
for more details.
When OverloadedLabels is enabled, if GHC sees an occurrence of
the overloaded label syntax #foo, it is replaced with
fromLabel @"foo" :: alpha
plus a wanted constraint IsLabel "foo" alpha.
Note that if RebindableSyntax is enabled, the desugaring of
overloaded label syntax will make use of whatever fromLabel is in
scope.